Ann: Section 708A Notice and Appendix 3B, page-209

https://www.acnnewswire.com/press-release/english/50565/greentech-technology-announces-2018-annual-results

Have a read of this article Tmax. I reckon Yunnan tin would be the most likely.

"The Group has long been focusing on tin mining business given that it is optimistic about the long-term fundamentals of this scarce metal. In addition, the supply shortage of tin metal is expected to drive tin price, thereby bringing positive impacts to the the Group's income. Looking forward, the Group will continue to seize the opportunities in the fast-growing industry, actively enhance the production volume of tin metal and operational efficiency in order to boost income, thus bringing more fruitful returns to investors and shareholders."

Although as surat says it'd be nice if Rio have a sniff. They did announce tin will be the metal expected to be the most impacted by new technology. Then they can put the tin in tinto